Question 1

How do I calculate the distance between two coordinates using phpgeo?

Accepted Answer

Use the Coordinate class with a distance calculator like Vincenty. For example, `$coordinate1->getDistance($coordinate2, new Vincenty())` returns the distance in meters, as shown in the README with the Mauna Kea and Haleakala summits example.

Question 2

phpgeo vs geoPHP: which is better for PHP geographic calculations?

Accepted Answer

phpgeo focuses on high-precision calculations and modern PHP support, while geoPHP might offer broader geometry operations but often has less active maintenance. phpgeo's detailed documentation and regular updates make it a strong choice for new projects requiring accuracy.

Question 3

How to check if a point is inside a polygon with phpgeo?

Accepted Answer

Create a Polygon object using the addPoint method and call contains() with a Coordinate. The README example shows `$geofence->contains($point)` returning a boolean, but note the limitation with polygons crossing the international date line.

Question 4

What are the main limitations of phpgeo?

Accepted Answer

Key limitations include incorrect results for polygons spanning the 180/-180 meridian, no built-in mapping features, and dependency on recent PHP versions. It's best suited for backend calculations without real-time visualization needs.

Question 5

How to format coordinates as GeoJSON in phpgeo?

Accepted Answer

Use the GeoJSON formatter with the Coordinate class. As per the documentation, `$coordinate->format(new GeoJSON())` outputs a valid GeoJSON string, such as `{ "type" : "point" , "coordinates" : [ -155.678268, 18.911306 ] }`.

Question 6

Is phpgeo good for simplifying GPS tracks?

Accepted Answer

Yes, it includes a Simplify processor using the Ramer–Douglas–Peucker algorithm to reduce polyline complexity. The README example shows how to remove points based on a perpendicular distance threshold, useful for saving storage or bandwidth.

PHPGeo

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